str -> Optional[Str] in create_starting_node_tree

[zachcp]

Molecule.create_object() calls this function which has branch for None but a type that is only str

def create_starting_node_tree(
    object: bpy.types.Object,
    coll_frames: bpy.types.Collection | None = None,
    style: str = "spheres",
    name: str | None = None,
    color: Optional[str]  = "common",
    material: str = "MN Default",
...
...
    # if requested, setup the nodes for generating colors in the node tree
    if color is not None:    <---- allowing this to be set
        if color == "common":
            node_color_set = add_custom(tree, "Set Color", [200, 0])
            node_color_common = add_custom(tree, "Color Common", [-50, -150])
            node_random_color = add_custom(tree, "Color Attribute Random", [-300, -150])
...
...

[BradyAJohnston]

Just updated with the optional types that were introduced in python 3.10 which is overall what I would like the code base to move towards.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.96%. Comparing base (9d371e1) to head (0834d2f).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #753      +/-   ##
==========================================
- Coverage   79.06%   78.96%   -0.11%     
==========================================
  Files          80       80              
  Lines        5317     5328      +11     
==========================================
+ Hits         4204     4207       +3     
- Misses       1113     1121       +8     

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